166020061 has 2 divisors, whose sum is σ = 166020062. Its totient is φ = 166020060.

The previous prime is 166020047. The next prime is 166020067. The reversal of 166020061 is 160020661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165636900 + 383161 = 12870^2 + 619^2 .

It is an emirp because it is prime and its reverse (160020661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166020061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166020067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83010030 + 83010031.

It is an arithmetic number, because the mean of its divisors is an integer number (83010031).

Almost surely, 2^166020061 is an apocalyptic number.

It is an amenable number.

166020061 is a deficient number, since it is larger than the sum of its proper divisors (1).

166020061 is an equidigital number, since it uses as much as digits as its factorization.

166020061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 166020061 is about 12884.8772209905. The cubic root of 166020061 is about 549.6086041822.

The spelling of 166020061 in words is "one hundred sixty-six million, twenty thousand, sixty-one".